Final answer:
TLDs are radiation detectors used to measure radiation exposure, but they are not personal radiation monitors.
Step-by-step explanation:
TLDs, or ThermoLuminescent Dosimeters, are radiation detectors that are commonly used in medical and industrial applications to measure radiation exposure. The statements A, C, and D are true about TLDs, but statement B is incorrect. A TLD is not a personal radiation monitor; it is a type of detector that uses a special phosphor material to measure radiation exposure. It does not provide real-time monitoring like a personal radiation monitor would.